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Titolo:
Effective population sizes for cytoplasmic and nuclear genes in a gynodioecious species: The role of the sex determination system
Autore:
Laporte, V; Cuguen, J; Couvet, D;
Indirizzi:
Univ Lille 1, Lab Genet & Evolut Populat Vegetales, UPRESA CNRS 8016, FR CNRS 1818, F-59655 Villeneuve Dascq, France Univ Lille 1 Villeneuve Dascq France F-59655 55 Villeneuve Dascq, France Museum Natl Hist Nat, Ctr Rech Biol Populat Oiseaux, F-75005 Paris, FranceMuseum Natl Hist Nat Paris France F-75005 Oiseaux, F-75005 Paris, France
Titolo Testata:
GENETICS
fascicolo: 1, volume: 154, anno: 2000,
pagine: 447 - 458
SICI:
0016-6731(200001)154:1<447:EPSFCA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
THYMUS-VULGARIS L; PLANTAGO-LANCEOLATA L; MALE-STERILITY; NATURAL-POPULATIONS; FINITE POPULATIONS; BETA-MARITIMA; MAINTENANCE; POLYMORPHISM; EVOLUTION; GENETICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Laporte, V Univ Edinburgh, Ashworth Lab, Inst Cell Anim & Populat Biol, Kings Bldgs,WMains Rd, Edinburgh EH9 3JT, Midlothian, Scotland Univ EdinburghKings Bldgs,W Mains Rd Edinburgh Midlothian Scotland EH9 3JT
Citazione:
V. Laporte et al., "Effective population sizes for cytoplasmic and nuclear genes in a gynodioecious species: The role of the sex determination system", GENETICS, 154(1), 2000, pp. 447-458

Abstract

Equations are derived for the effective sizes of gynodioecious populationswith respect to both nuclear and cytoplasmic genes (N-ec and N-en, respectively), Compared to hermaphroditism, gynodioecy generally reduces effectivepopulation sizes for both kinds of loci to an extent depending on the frequency of females, the sex determination system, and the selfing rate of hermaphrodites. This reduction is due to fitness differences between the sexesand is highly influenced by the mode of inheritance of this fitness, In absence of selfing, nuclear gynodioecy results in a reduction of N-ec that depends strongly on the dominance of male sterility alleles, while N-en remains equal to the census number (N). With cytonuclear gynodioecy, both cytoplasmic and nuclear effective sizes are reduced, and at the extreme, dioecy results in the minimum N-ec values and either minimum or maximum N-en values(for low or high frequency of females, respectively). When selfing occurs,gynodioecy either increases or decreases N-en as compared to hermaphroditism with the same selfing rate of hermaphrodites. Unexpectedly, N-ec also varies with the selfing rate. Thus the genetic sex-determination system appears as a major factor for the nuclear and cytoplasmic genetic diversities ofgynodioecious species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 20:24:55